diff --git a/lib/SimpleSAML/Metadata/MetaDataStorageHandlerFlatFile.php b/lib/SimpleSAML/Metadata/MetaDataStorageHandlerFlatFile.php
index ba5987aee2400b7e63f24c71244626d1d2168321..2d7883b8c96cfaefc228266581498b5115ca23d3 100644
--- a/lib/SimpleSAML/Metadata/MetaDataStorageHandlerFlatFile.php
+++ b/lib/SimpleSAML/Metadata/MetaDataStorageHandlerFlatFile.php
@@ -125,7 +125,7 @@ class MetaDataStorageHandlerFlatFile extends MetaDataStorageSource
     }
 
 
-    public function generateDynamicHostedEntityID($set)
+    private function generateDynamicHostedEntityID($set)
     {
         // get the configuration
         $baseurl = \SimpleSAML\Utils\HTTP::getBaseURL();